5 Wrong ways to check empty strings

It is one of the common mistake that people compare a string with “” or String.Empty in VB.Net or C# to find its empty. Here are few examples.

// C# Wrong Ways

1. if ( s == “” )
2. if ( s == string.Empty )
3. if ( s.Equals(”") )
4. if ( s.Equals ( String.Empty)
5. if ( string.Equals(s,”")
6. if ( string.Equals ( s,String.Empty ))

So what’s the correct way to do it ? Check for length too.

// [ C# ] Correct Way

if ( s.Length == 0 )